package com.demo1;

/**
 * Created by Administrator on 2017/3/25.
 */
public class CircleArea {
    public static void main(String[] args) {
        final double PI = 3.14;
        int R = 5;
        double circleArea = PI * R * R;
        System.out.println("圆的面积等于" + circleArea);
    }
}
